From 66910577beb4735b0e19ba72dd28be9c5594d91f Mon Sep 17 00:00:00 2001
From: David Sidrane <david_s5@nscdg.com>
Date: Thu, 23 Mar 2017 14:22:45 -1000
Subject: [PATCH] stm322_flash:missing unlock on F1 HSI off path

---
 arch/arm/src/stm32/stm32_flash.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/src/stm32/stm32_flash.c b/arch/arm/src/stm32/stm32_flash.c
index 3b4ebd8a10..3f079442d8 100644
--- a/arch/arm/src/stm32/stm32_flash.c
+++ b/arch/arm/src/stm32/stm32_flash.c
@@ -290,6 +290,7 @@ ssize_t up_progmem_erasepage(size_t page)
 #if !defined(CONFIG_STM32_STM32F40XX)
   if (!(getreg32(STM32_RCC_CR) & RCC_CR_HSION))
     {
+      sem_unlock();
       return -EPERM;
     }
 #endif